If you haven’t already done so, you need to look at sections 142 -144 of the Act which, among other things, require the owners who are the beneficiaries of common property rights by-laws to agree in writing to their creation.
You should also take a close look at the responsibilities for repair and maintenance of the solar panels and the roof where they are installed. For instance, you might want the owners corp to retain responsibility for the roof but the individual owners to have responsibility for their solar panels.
Or you could have the OC install the entire array and find a way of charging owners for electricity they use.
To be honest, I think you should be presenting a motion that empowers you to go ahead and draw up the by-laws, once you have established what the majority of owners want, then present them at an EGM held at a later date specifically for that purpose.